When we have an audience of several hundred mobile phone toting humans, the XR16 and XR18 run into connecting problems. The only cure we have found so far is to get the audience to turn off their mobile phones. Initially we used open wifi, then used a passphrase, then changed channels (difficult to do when your mixer is being troublesome!). No help. Had not updated to 1.17 firmware until after this morning's gig, so don't know if that helps. (I posted this on a facebook, but can't find that site again!) Is there a way to set the access point invisible, so everyone's phones do not try to connect to it?